diff options
Diffstat (limited to 'include/hash.h')
| -rw-r--r-- | include/hash.h | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/include/hash.h b/include/hash.h new file mode 100644 index 00000000..c0a846ac --- /dev/null +++ b/include/hash.h @@ -0,0 +1,107 @@ +/* Copyright (c) 2000, 2010, Oracle and/or its affiliates. + Copyright (c) 2011, 2013, Monty Program Ab. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; version 2 of the License. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */ + +/* Dynamic hashing of record with different key-length */ + +#ifndef _hash_h +#define _hash_h + +#include "my_sys.h" /* DYNAMIC_ARRAY */ + +/* + This forward declaration is used from C files where the real + definition is included before. Since C does not allow repeated + typedef declarations, even when identical, the definition may not be + repeated. +*/ +#ifdef __cplusplus +extern "C" { +#endif + +/* + Overhead to store an element in hash + Can be used to approximate memory consumption for a hash + */ +#define HASH_OVERHEAD (sizeof(char*)*2) + +/* flags for hash_init */ +#define HASH_UNIQUE 1 /* hash_insert fails on duplicate key */ +#define HASH_THREAD_SPECIFIC 2 /* Mark allocated memory THREAD_SPECIFIC */ + +typedef uint32 my_hash_value_type; +typedef uchar *(*my_hash_get_key)(const uchar *,size_t*,my_bool); +typedef my_hash_value_type (*my_hash_function)(CHARSET_INFO *, + const uchar *, size_t); +typedef void (*my_hash_free_key)(void *); +typedef my_bool (*my_hash_walk_action)(void *,void *); + +typedef struct st_hash { + size_t key_offset,key_length; /* Length of key if const length */ + size_t blength; + ulong records; + uint flags; + DYNAMIC_ARRAY array; /* Place for hash_keys */ + my_hash_get_key get_key; + my_hash_function hash_function; + void (*free)(void *); + CHARSET_INFO *charset; +} HASH; + +/* A search iterator state */ +typedef uint HASH_SEARCH_STATE; + +#define my_hash_init(A,B,C,D,E,F,G,H,I) my_hash_init2(A,B,0,C,D,E,F,G,0,H,I) +my_bool my_hash_init2(PSI_memory_key psi_key, HASH *hash, size_t growth_size, + CHARSET_INFO *charset, size_t default_array_elements, + size_t key_offset, size_t key_length, + my_hash_get_key get_key, my_hash_function hash_function, + void (*free_element)(void*), uint flags); +void my_hash_free(HASH *tree); +void my_hash_reset(HASH *hash); +uchar *my_hash_element(HASH *hash, size_t idx); +uchar *my_hash_search(const HASH *info, const uchar *key, size_t length); +uchar *my_hash_search_using_hash_value(const HASH *info, + my_hash_value_type hash_value, + const uchar *key, size_t length); +my_hash_value_type my_hash_sort(CHARSET_INFO *cs, + const uchar *key, size_t length); +#define my_calc_hash(A, B, C) my_hash_sort((A)->charset, B, C) +uchar *my_hash_first(const HASH *info, const uchar *key, size_t length, + HASH_SEARCH_STATE *state); +uchar *my_hash_first_from_hash_value(const HASH *info, + my_hash_value_type hash_value, + const uchar *key, + size_t length, + HASH_SEARCH_STATE *state); +uchar *my_hash_next(const HASH *info, const uchar *key, size_t length, + HASH_SEARCH_STATE *state); +my_bool my_hash_insert(HASH *info, const uchar *data); +my_bool my_hash_delete(HASH *hash, uchar *record); +my_bool my_hash_update(HASH *hash, uchar *record, uchar *old_key, + size_t old_key_length); +void my_hash_replace(HASH *hash, HASH_SEARCH_STATE *state, uchar *new_row); +my_bool my_hash_check(HASH *hash); /* Only in debug library */ +my_bool my_hash_iterate(HASH *hash, my_hash_walk_action action, void *argument); + +#define my_hash_clear(H) bzero((char*) (H), sizeof(*(H))) +#define my_hash_inited(H) ((H)->blength != 0) +#define my_hash_init_opt(A,B,C,D,E,F,G,H,I) \ + (!my_hash_inited(B) && my_hash_init(A,B,C,D,E,F,G,H,I)) + +#ifdef __cplusplus +} +#endif +#endif |